Pakistan’s incoming prime minister said Monday he wanted to strengthen his country’s fractious relations with the United States but warned Washington must take seriously their concerns about drone strikes.

Nawaz Sharif, who won an unprecedented third term in Saturday’s general election, said the US would have Pakistan’s “full support” as it withdraws the bulk of its forces from Afghanistan by the end of next year.

Missile attacks by unmanned drone aircraft on militant targets in Pakistan’s tribal northwest, a haven for Taliban and al Qaeda fighters along the Afghan border, have been a public thorn in relations in recent years.